Does Orangeburg, SC need an earthquake retrofit?

USGS's ASCE 7-16 seismic design model - the same standard building codes use - places Orangeburg in Seismic Design Category D: High seismic hazard - this is the category most of coastal California, the Pacific Northwest, and other active fault regions fall into. Code mandates significant seismic detailing and restricts irregular structural configurations. This is the category the Brace + Bolt scope (cripple-wall bracing, foundation bolting) is built for. That puts Orangeburg in the 83th percentile nationally for seismic hazard - higher than 83% of the 4,875 US cities USGS was checked against here.

How Orangeburg compares

USGS's underlying values for Orangeburg: 0.247g peak ground acceleration, 0.426g at short period, 0.135g at 1 second. Within South Carolina alone, Orangeburg ranks 14 of 66 cities by seismic hazard - the 80th percentile in-state. Orangeburg has a population of about 13,378.

What a retrofit costs in Orangeburg

A full earthquake retrofit typically runs $5,000-$10,000 nationally (around $7,000 typical), driven mainly by house size and foundation type, not by South Carolina specifically. California's Earthquake Brace + Bolt grant, which covers a large share of this cost, is a California-only program and does not apply in South Carolina.

Earthquake insurance for a Orangeburg home

A Orangeburg homeowner cannot buy a standalone earthquake policy in most cases - it is added to an existing homeowners policy as an endorsement, so the place to start is a regular home-insurance quote.

Where Orangeburg's figures come from

Orangeburg's Category D and every number above trace to USGS's own ASCE 7-16 Design Maps service - see the methodology guide. See the category explainer for what Category D does and doesn't tell you about Orangeburg.